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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">CURLINFO_TLS_SESSION - get TLS session info <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre class="level0">
&#35;include &lt;curl/curl.h&gt;
&nbsp;
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_TLS_SESSION,
&nbsp;                          struct curl_tlssessioninfo **session);
</pre>
<a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">Pass a pointer to a 'struct curl_tlssessioninfo *'.  The pointer will be initialized to refer to a 'struct curl_tlssessioninfo *' that will contain an enum indicating the SSL library used for the handshake and the respective internal TLS session structure of this underlying SSL library. 
<p class="level0">This may then be used to extract certificate information in a format convenient for further processing, such as manual validation. NOTE: this option may not be available for all SSL backends; unsupported SSL backends will always return NULL in the <span Class="emphasis">internals</span> pointer to indicate that they are not supported. 
<p class="level0"><pre class="level0">
struct curl_tlssessioninfo {
&nbsp; curl_sslbackend backend;
&nbsp; void *internals;
};
</pre>

<p class="level0">
<p class="level0">The <span Class="emphasis">backend</span> struct member is one of the defines in the CURLSSLBACKEND_* series: CURLSSLBACKEND_NONE (when built without TLS support), CURLSSLBACKEND_OPENSSL, CURLSSLBACKEND_GNUTLS, CURLSSLBACKEND_NSS, CURLSSLBACKEND_GSKIT, CURLSSLBACKEND_POLARSSL, CURLSSLBACKEND_CYASSL, CURLSSLBACKEND_SCHANNEL, CURLSSLBACKEND_DARWINSSL or CURLSSLBACKEND_AXTLS. (Note that the OpenSSL forks are all reported as just OpenSSL here.) 
<p class="level0">The <span Class="emphasis">internals</span> struct member will point to a TLS library specific pointer with the following underlying types: 
<p class="level1">
<p class="level0"><a name="OpenSSL"></a><span class="nroffip">OpenSSL</span> 
<p class="level1">SSL_CTX * 
<p class="level0"><a name="GnuTLS"></a><span class="nroffip">GnuTLS</span> 
<p class="level1">gnutls_session_t 
<p class="level0"><a name="NSS"></a><span class="nroffip">NSS</span> 
<p class="level1">PRFileDesc * 
<p class="level0"><a name="gskit"></a><span class="nroffip">gskit</span> 
<p class="level1">gsk_handle 
<p class="level0"><a name="PROTOCOLS"></a><h2 class="nroffsh">PROTOCOLS</h2>
<p class="level0">All TLS-based <a name="EXAMPLE"></a><h2 class="nroffsh">EXAMPLE</h2>
<p class="level0">TODO <a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
<p class="level0">Added in 7.34.0 <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><span Class="manpage">curl_easy_getinfo (3)</span>, <span Class="manpage">curl_easy_setopt (3)</span><p class="roffit">
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